Re: [avr-gcc-list] generating a delay

[varsha]

hi!!

i used the delay routines defined in avr/delay.h file, for generating microseconnd and ms delays.

for generating delay of nanoseconds,

u can take a variable which is declared globally,

or a variable declared with volatile keyword...

asign some value to it..it will generate a small delay in nanoseconds...

 

----- Original Message -----

From: Sebastian Moss

To: varsha

Sent: Monday, October 24, 2005 1:13 PM

Subject: RE: [avr-gcc-list] generating a delay

Don’t know about it being a ‘proper’ way but you could do a bit of inline assembler…

 

            ldi         r16,       0

start_loop:

            nop                                           ; nop or 2

            inc        r16

            cpi        r16,       ( a value )

            brne      start_loop

 

and count the clocks to work out  ( a value ) for the right delay at 8mhz. Timer/sleep could be better for 25ms though as this is the processing-intensive way ;P

See if you can find an implementation of nanosleep!

 

seb

 

 

-----Original Message-----
From: varsha [mailto:address@hidden
Sent: Monday, 24 October 2005 4:38 PM
To: address@hidden
Subject: [avr-gcc-list] generating a delay

 

Hello all,

I'm working on avr-gcc (GCC) 3.4.3

Atmega 16 controller, clock frequecy is 8 MHz,

and i want to generate a delay of 25ms.

and i wrote one routine for the same..

and called it in other function as

delay(250,0xff);

-

-

- but i think it is not generating the correct value...

---------------------------------------------------------------------------------------

void delay_ms(unsigned char count1,unsigned char count)
{
 unsigned char j,i;
 while(count1--)
  {
    while(count--)
   {
    i++;
    j++;
   }  
  }
}

 what is the proper way to write a delay routine?

 

 

 

regards,
varsha

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